کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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727108 | 892685 | 2011 | 9 صفحه PDF | دانلود رایگان |
Electrostatic potential decay on corona-charged low-density polyethylene (LDPE) was recorded as a function of position and time, using a macroscopic scanning electrode and also Kelvin force microscopy. Potential decays independently in adjacent sample areas until reaching equilibrium at negative values (4.6 ± 0.7 V), irrespective of the initial potential signal. Other observations already described in literature were confirmed: negative potential decays slower than positive potential and the relative humidity has a large effect on the dissipation rates. These results are discussed considering ion exchange associated to adsorption and desorption of water clusters at the solid–gas interface.
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► LDPE surface heterogeneity is revealed by electrostatic potential mapping.
► Large potential gradients (10–15 MV/m) are measured along the surface.
► Potential decay is faster in the initially positive areas.
► An equilibrium potential −4.6 V is reached in initially positive and negative areas.
► Humid atmosphere is a charge reservoir for dielectrics.
Journal: Journal of Electrostatics - Volume 69, Issue 4, August 2011, Pages 401–409